I also just confirmed that all 11 speeds of a Dura-Ace RD-9070 rear derailleur will work on an otherwise complete 6770 10-speed system. In other words, the rear derailleur alone determines whether a system is 10 or 11 speed.

Notes:+ I am running the latest firmware all components. + I did not test the RD-6870 since they're not widely available yet. However, I expect them to behave the same as the RD-9070.+ Starbike just listed the RD-6870 as in stock (180 EU/250 US): http://www.starbike.com/en/shimano-rd-6870/

I also just confirmed that all 11 speeds of a Dura-Ace RD-9070 rear derailleur will work on an otherwise complete 6770 10-speed system. In other words, the rear derailleur alone determines whether a system is 10 or 11 speed.

Notes:+ I am running the latest firmware all components. + I did not test the RD-6870 since they're not widely available yet. However, I expect them to behave the same as the RD-9070.+ Starbike just listed the RD-6870 as in stock (180 EU/250 US): http://www.starbike.com/en/shimano-rd-6870/

this is excellent solid configuration. great to hear and confirmed. I'll be ordering parts. I still need to get the firmware updated

6870 Rear derailleur in the post. Hopefully arriving by Friday. 11 speed cassette, chain and Ultegra 6800 wheel set ordered at LBS so should have 11speed up and running on an otherwise 6770 groupset this weekend.

6870 Rear derailleur in the post. Hopefully arriving by Friday. 11 speed cassette, chain and Ultegra 6800 wheel set ordered at LBS so should have 11speed up and running on an otherwise 6770 groupset this weekend.

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